Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 140, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.106187
Keywords
Metal-matrix composites; Bioinspired laminated structure; Mechanical properties; Flake powder metallurgy
Funding
- National Natural Science Foundation of China [51671130, 51871149, 51971206]
- Ministry of Education of China [B16032]
- Shanghai Science and Technology Committee [17ZR1441500, 19ZR1474900]
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Inspired by the design principle of nacre, a bottom-up strategy was employed in the fabrication of bioinspired laminated composites with a brick-and-mortar structure. The composites achieved a significant enhancement in strength with a slight compromise on ductility, leading to improved toughness compared to the corresponding Al matrix.
Inspired by nacre's design principle, a bottom-up strategy by self-assembly alignment of flake powders, namely flake powder metallurgy, is employed to fabricate bioinspired laminated composites with brick-and-mortar structure. The microscale flake Al2O3 powders and flake Al powders with native Al2O3 nanolayers are utilized to fabricate the bioinspired hierarchical Al2O3/Al laminated composites, and the composites with 5 vol% Al2O3 achieves an enhancement of 22% in strength with only a 7% compromise on ductility, leading to a notable improvement in toughness (17%) compared to the corresponding Al matrix. The higher strain hardening due to enhanced dislocation accumulation capacity at hierarchical Al2O3/Al interface can delay the occurrence of necking, and the large elongation after peak stress is attributed to multiple extrinsic toughening effect from brick and-mortar structure. The bottom-up strategy can guide the design and fabrication of advanced bioinspired laminated composites to achieve enhanced mechanical performance.
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